1. Introducció
The Nobsound 6P1 6.8W x 2 Vacuum Tube Power Amplifier is a handcrafted stereo Class A single-ended audio amplifier designed to deliver a rich, analog sound experience. This amplifier features transformer parallel output for improved power and utilizes antimagnetic transformer covers to minimize current interference, resulting in a low static noise floor. Its robust construction and classic aesthetic, complete with VU meters and visible vacuum tubes, make it a distinguished addition to any audio setup. This manual provides essential information for the safe and effective use of your ampmés viu.

Figura 1.1: Frontal view of the Nobsound 6P1 Vacuum Tube Power Ampvidador, espectacleasing its vacuum tubes, VU meters, and volume control.
2. Instruccions de seguretat
Please read and adhere to the following safety precautions to prevent damage to the amplifier and ensure personal safety:
- Generació de calor: Vacuum tubes generate significant heat during operation. Do not touch the tubes or surrounding metal parts while the amplifier is on or immediately after turning it off. Allow sufficient time for cooling.
- Ventilació: Assegureu-vos una ventilació adequada al voltant amplifier. Do not place it in an enclosed space or cover its vents. Maintain at least 10 cm (4 inches) of clear space on all sides.
- Font d'alimentació: Connecteu el amplifier only to a power outlet with the correct voltage (110-120V AC for North America). Use the provided power cord or a suitable replacement.
- Humitat: Mantenir el amplifier away from water, moisture, and high humidity. Do not operate it with wet hands.
- Objectes estrangers: Do not insert any objects into the amplifier's openings.
- Manteniment: Refer all servicing to qualified service personnel. Do not attempt to open or repair the amplificar-se.
- Col·locació: Col·loca el amplifier on a stable, level surface away from direct sunlight, heat sources, and strong electromagnetic fields.
3. Contingut del paquet
Carefully unpack the box and ensure all items listed below are present and in good condition.
- 1 × Nobsound 6P1 Vacuum Tube Power Ampmés viu
- 1 × cable d'alimentació
- Set of Vacuum Tubes (pre-installed or separately packaged)

Figure 3.1: Contents of the Nobsound 6P1 amppaquet lificador, incloent-hi el amplifier unit and power cord.
4. Configuració
4.1 Desembalatge i inspecció inicial
Traieu el amplifier and all accessories from the packaging. Inspect the unit for any signs of physical damage that may have occurred during transit. If any damage is found, contact your retailer immediately. Note that a slight chemical smell may be present upon initial unboxing; this is normal for new electronic products and will dissipate over time.
4.2 Instal·lació del tub
If the vacuum tubes are not pre-installed, carefully insert them into their respective sockets. It is recommended to wear clean gloves (e.g., cotton gloves) when handling tubes to avoid leaving fingerprints, which can affect tube lifespan. Each tube has a keyway on its base that aligns with a notch in the socket. Gently push the tube straight down until it is firmly seated. Do not force the tubes.

Figura 4.1: Part inferior view de la amplifier, illustrating the arrangement of tube sockets for proper tube installation.
4.3 Connexions
Before connecting any cables, ensure the ampl'amplificador està apagat i desendollat de la presa de corrent.
- Entrada (IN): Connect your audio source (e.g., CD player, DAC, pre-amplifier) to the "IN" RCA jacks on the rear panel. Ensure left (L) and right (R) channels are correctly matched.
- Sortida (OUT): Connect your passive speakers to the "OUT" speaker terminals. The amplifier supports 8Ω impedance speakers. Connect the positive (+) terminal of the amplifier to the positive (+) terminal of your speaker, and the negative (-) terminal of the amplifier to the negative (-) terminal of your speaker. Ensure secure connections to prevent short circuits.
- Potència: Once all audio connections are made, connect the power cord to the amplifier's AC inlet and then to a suitable wall outlet.

Figura 4.2: Panell posterior del amplifier, detailing the RCA input jacks and speaker output terminals for connecting audio sources and speakers.
5. Instruccions de funcionament
5.1 Engegada/apagada
Per encendre el amplifier, flip the "POWER" toggle switch on the front panel to the "ON" position. The vacuum tubes will begin to glow, and the VU meters may illuminate. Allow the amplifier to warm up for at least 15-30 minutes for optimal sound performance. This "burn-in" period is crucial for tube amplifiers. To power off, flip the "POWER" switch to the "OFF" position.

Figura 5.1: El/La/Els/Les amplifier in operation, with its vacuum tubes illuminated, signifying that the unit is powered on and ready for use.
5.2 Control de volum
Adjust the master volume using the large "VOLUME" knob on the front panel. Turn clockwise to increase volume and counter-clockwise to decrease it. The knob has stepped intervals for precise adjustment.
5.3 VU Meters
The two VU (Volume Unit) meters on the front panel provide a visual representation of the audio signal level for the left and right channels. They indicate the average loudness of the audio passing through the amplifier. While primarily aesthetic, they can help monitor signal presence and relative output levels.

Figura 5.2: Primer pla de la amplifier's front panel, showing the power switch, VU meters, and volume control knob.
6. Manteniment
6.1 Neteja
Per netejar el amplifier, first ensure it is powered off and unplugged. Use a soft, dry, lint-free cloth to wipe down the exterior surfaces. For stubborn marks, a slightly damp cloth can be used, followed immediately by a dry cloth. Avoid using harsh chemicals, abrasive cleaners, or solvents, as these can damage the finish.
6.2 Tube Care and Replacement
Vacuum tubes have a finite lifespan and may require replacement over time. Signs of aging tubes include reduced sound quality, increased noise, or uneven performance. When replacing tubes, ensure the amplifier is completely cool and unplugged. Carefully grasp the tube at its base and gently rock it while pulling upwards to remove it. Insert new tubes following the installation instructions in Section 4.2. Always replace tubes with compatible types to maintain optimal performance.
7. Solució De Problemes
If you encounter any issues with your Nobsound 6P1 amplifier, consulteu els següents problemes i solucions habituals:
| Problema | Causa possible | Solució |
|---|---|---|
| Sense sortida de so |
|
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| Soroll de brunzit o brunzit |
|
|
| So distorsionat o feble |
|
|
| La unitat s'escalfa molt |
|
|
8. Especificacions
| Característica | Detall |
|---|---|
| Marca | Nobsound |
| Número de model | 4330977234 |
| Potència de sortida | 6.8W x 2 (Stereo Class A Single-Ended) |
| Nombre de canals | 2 |
| Voltage | 110-120 volts (CA) |
| Material | Metall |
| Pes de l'article | 15.25 lliures (aprox. 6.92 kg) |
| Dimensions del paquet | 15.2 x 13.1 x 9.8 polzades (aprox. 38.6 x 33.3 x 24.9 cm) |
| Tipus de muntatge | Muntatge en superfície |
| Especificació Met | FCC |
| Data de primera disponibilitat | 17 de juliol de 2017 |
9. Garantia i Suport
For information regarding warranty coverage, technical support, or service inquiries, please refer to the purchase documentation or contact Nobsound customer service directly through their official weblloc web o la plataforma on es va comprar el producte. Conserveu el rebut de compra com a comprovant de compra.
You can visit the Nobsound Store for more information and products: Nobsound Official Store.





